Henry dbeyftts



Patented Dec. 26, 1922'.

UNITED ,STATES PATENT OFFICE.

HENRY DREYFUS, OF LONDON, ENGIKIAZND- CELLULOSE ACETATE COMPOSITION.

llo Drawing,

England. have invented certain new and Relating to useful Improvements in or of which (ellulose Acetate Compositions. the following is a specification.

This invention relates to the manufacture of solutions, varnishes, celluloid-like products, plastic masses, films, artificial silk, or other. products, preparations, or articles made with cellulose acetates. 'Any such solutions, preparations and products are hereinafter included in the term composition of matter. The invention is characterized by the employment of 'cyclobutanones. that is to say ketotetramethylene and its side chain homologues, such as tliiuethyl or diethyl cyclobutanone, as solvents of cellulose acetates in the manufacture of such solutions, products, preparations or articles. i

I have found especially that cyclohutanone is an excellent solvent for cellulose acetates. This substance which is represented by the formula hoils at about 90101 It has a very great solvent power for cellulose acetates,

l and IS a better solvent tor the same than cyclohexanone.

The cyclobutanone or side chain homologues thereof may be employed in any de sired quantity relatively to the cellulose acetate. either alone or together with any known or suitable diluents or-solvents. such as methyl alcohol, ethyl alcohol, acetone, methyl acetate. alcoliohhenzol mixture and so forth. Any other usual or suitable suhstances, such for instance as plzrsticiziiu; agents, camphor substitutes, filling suhstances, colouring matters and so forth. may be added or employed in makin the solutions, plastic-masses, compositiins. films,

artificial silk, or other products according to the particular object in view.

Application filed September 21, 1922. Serial in. 589,892.

The following examples will serve to illustrate some ractical applications of the invention, it eing understood that they are only illustrative and can be varied widely.

Example 1. For a solution or varnish- Berta. Cellulose acetate 100 Cyclobutanone 1000 (ellulose acetate 100 ('yclohutauone 100-500 Methyl acetate or acetone 900500 I Ewam pl e fii For a' plastic or celluloid-like 1na'ss--, Parts. Cellulose acetate 10O (lyclohutanonu Methyl acetate, acetone or alcohoh 100 Triphenylphosphate 1215 More or less of the solvents may be'emcellulose acetate and cyclobutanone.

3. A composition of matter containing cellulose acetate, :1 ketotetramethylene compound and a plasticizing agent.

In testimony whereof I have hereunto subscrihetl my name.

HENRY DREYFUS.

. 2. A composition of matter. containing 

